source: trunk/libs/newlib/src/libgloss/m32c/sample.c @ 673

Last change on this file since 673 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 4.1 KB
Line 
1/*
2
3Copyright (c) 2008 Red Hat Incorporated.
4All rights reserved.
5
6Redistribution and use in source and binary forms, with or without
7modification, are permitted provided that the following conditions are met:
8
9    Redistributions of source code must retain the above copyright
10    notice, this list of conditions and the following disclaimer.
11
12    Redistributions in binary form must reproduce the above copyright
13    notice, this list of conditions and the following disclaimer in the
14    documentation and/or other materials provided with the distribution.
15
16    The name of Red Hat Incorporated may not be used to endorse
17    or promote products derived from this software without specific
18    prior written permission.
19
20THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23DISCLAIMED.  IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
24DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31*/
32
33/* This is a sample program that shows how to use a few of the
34   features of the M32C port of GCC, Binutils, and Newlib.  */
35
36#include <varvects.h>
37
38typedef unsigned char byte;
39typedef unsigned short word;
40
41#define prcr    (*(volatile byte *)0x000a)
42#define cm0     (*(volatile byte *)0x0006)
43#define cm1     (*(volatile byte *)0x0007)
44#define ocd     (*(volatile byte *)0x000c)
45
46#ifdef __r8c_cpu__
47/* These are for the R8C/20 with LEDs on port P2 */
48
49#define tracr   (*(volatile byte *)0x0100)
50#define traioc  (*(volatile byte *)0x0101)
51#define tramr   (*(volatile byte *)0x0102)
52#define trapre  (*(volatile byte *)0x0103)
53#define tra     (*(volatile byte *)0x0104)
54#define traic   (*(volatile byte *)0x0056)
55
56#define pd2     (*(volatile byte *)0x00e6)
57#define p2      (*(volatile byte *)0x00e4)
58
59#define ivec_timer_ra 22
60#endif
61
62#ifdef __m32c_cpu__
63/* These are for the M32C/83 with LEDs on port P0 and P1 */
64
65#define ta0     (*(volatile word *)0x0346)
66#define ta0mr   (*(volatile byte *)0x0356)
67#define tabsr   (*(volatile byte *)0x0340)
68#define ta0ic   (*(volatile byte *)0x006c)
69
70#define pd0     (*(volatile byte *)0x03e2)
71#define pd1     (*(volatile byte *)0x03e3)
72#define p0      (*(volatile byte *)0x03e0)
73#define p1      (*(volatile byte *)0x03e1)
74
75#define ivec_timer_a0 12
76#endif
77
78/* Newlib's exit() pulls in lots of other things.  Main() should never
79   exit, but if it did, you could hard-reset the chip here.  */
80void
81exit(int rv)
82{
83  while (1)
84    asm volatile ("");
85}
86
87#ifdef __r8c_cpu__
88/* The "constructor" attribute causes the startup code to call this
89   sometime before main() is called.  */
90__attribute__((constructor))
91void
92fast_clock(void)
93{
94  asm("fclr I");
95  prcr = 1;
96  cm0 = 0x08;
97  cm1 = 0x38;
98  asm("nop");
99  asm("nop");
100  asm("nop");
101  asm("nop");
102  ocd = 0;
103  prcr = 0;
104  asm("fset I");
105}
106#endif
107
108/* We mark this volatile in case a non-interrupt function wants to
109   read it, else gcc may optimize away extra reads.  */
110static volatile int tc = 1;
111
112/* The "interrupt" attribute changes the function entry/exit to
113   properly preserve any changed registers.  */
114static void __attribute__((interrupt))
115timer_ra_interrupt()
116{
117  tc ++;
118#ifdef __r8c_cpu__
119  p2 = tc >> 4;
120#else
121  p1 = tc;
122  p0 = tc >> 8;
123#endif
124}
125
126main()
127{
128#ifdef __r8c_cpu__
129  pd2 = 0xff;
130
131  /* TIMER RA */
132  tracr = 0x00;
133  traioc = 0x00;
134  tramr = 0x00; /* timer mode, f1 */
135  trapre = 255; /* prescaler */
136  tra = 255; /* cycle count */
137
138  _set_var_vect (timer_ra_interrupt, ivec_timer_ra); 
139  traic = 5;
140  tracr = 1;
141#endif
142
143#ifdef __m32c_cpu__
144  pd0 = 0xff;
145  pd1 = 0xff;
146
147  /* TIMER A0 */ 
148  ta0mr = 0x00;                 /* Timer A0 mode register */
149  ta0 = 65535;                  /* Timer A0 register */
150
151  _set_var_vect (timer_ra_interrupt, ivec_timer_a0); 
152  ta0ic = 5;
153  tabsr = 0xff;
154#endif
155
156  /* main() must never return.  */
157  while (1)
158    ;
159}
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